Fix Electrical Problems by Understanding Voltage Drop Testing

In this video I am going to explain what is Voltage Drop, how you can perform a voltage drop test to find corroded wires or terminals, how voltage drop test is used to do a parasitic draw test on your battery, how voltage drop allows your cars computer to receive varying voltage from different sensors and how not to mistake voltage drop for measuring voltage.



Disclaimer:
Due to factors beyond the control of Ratchets and Wrenches, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Ratchets and Wrenches assumes no liability for any property or personal damage that may arise from doing a repair on your vehicle after watching any of my repair video's. Due to factors beyond the control of Ratchets and Wrenches, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Again Any injury, damage or loss that may result from improper use of tools, equipment, or the information contained in this video is the sole responsibility of the user and not Ratchets and Wrenches.

[ThunderbirdRocket]

I’d like to say thank you for sharing your knowledge. Great topic . We are now hitting at the gold in the mine ! Let’s get some ! Keep it coming please !!

[gusmpls]

In a series circuit the sum of all voltage drops is equal to source voltage. In series circuit the the current is the same throughout the circuit. In a parallel circuit voltage is the same but the current will be divided in each branch depending on the resistance. If all the branches have the same resistance then they would also have the same current.

[lout]

I'm a "long" time subscriber and I'm ok fixing my own car as long a lift is not required; however, this video is for way more advanced viewers. It's something I would love to understand plus I'm very excited you're back into car repairs. Admittedly I hope you future videos are not as complicated. Keep up the great work and I appreciate what I've learned. FYI I purchased a car (2008 Honda Civic) you recommended on you older videos for my step daughter. She still has it and it runs great.

[GalaxybutYT]

Another great video man. Thanks for the knowledge. 👍

[Viper]

Good to see you brother. Good topic and appreciate all the work you put into the videos. 👍😁

[uwcvxbl]

Wow, you have over a million subscribers. I'm happy for this

[johnsee]

Amazing! I did not know that... Brilliant explaination!

[mayflowerlash]

Despite having an engineering degree the use of a multimeter has always been a puzzle.
The electrical course in the degree was theoretical not practical. Hopefully when I follow your instructions it will make sense to me. Thanks for the lesson.

[CaptainVillanueva]

Wow he helped me understand that super fast!!! Damn man your a good teacher 🤘🏽

[nickayivor]

KNOWLEDGEABLE Ratchets and Wrench
Outstanding tutorial stuff loved it thank you very much helpful information video
Please do part 2 Voltage drop testing Please Ratchets and Wrench
From start to finish loved it 🌟🌟🌟🌟🌟
Take care and have a great Evening👍👌
KNOWLEDGEABLE Ratchets and Wrench
From Nick Ayivor from London England UK 🇬🇧

[JonnyDIY]

Whoosh. Most went over my head. Electrical is definitely not my strong suit! 🤣 But you are a great teacher 👍

[walkernottexasranger]

I had a coolant temp sensor fail on a later model Jeep Wrangler a while ago. I was doing my due diligence and testing the circuit and I noticed the 5v wire went from something like 2v to 5v when I unplugged it. I'm guessing this is super similar to what you were explaining in the video with the 5v circuit going to 12v. But if you could explain this clearly I'd be grateful. Great video thanks !

[math]

Very good work, im subscribe today, thx alot

[siko]

What would you recommend (tune-up wise) on a car that's been inactive for 5+ yrs?
Thanks and love the content!

[delinquentdesign]

A lot of vehicles use ground going to the ecm to send signal to the sensors can you explain more on those?

[matt_b...]

Man, lots of new videos lately. That new garage ain't gonna pay for itself!

[mbs]

I love the Ratchets and Wrenches channel, but I didn't seem to get much out of this video.

[warner]

Hi, I have. problem with dodge caravan. I changed the alternator and the battery was tested it is working, however. There is a sharp rapid drop in voltage after I turn the engine off. does within seconds from 12 to 9 volts. I have to jump start every single time I turn it off and even for gas filling at the pump. Do you have any suggestions on what that might be?

[ninjarider]

The two resistors in series form a voltage divider circuit. When the connector gets disconnected @16:00 and you read 12V instead of 5V, the resistor in the ECM is acting something like a pull-up resistor found in digital circuits.

[ceciliovillalobos]

Love it, are you located in Los Angeles